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EP1246347B1 - Vehicle AC generator - Google Patents

Vehicle AC generator Download PDF

Info

Publication number
EP1246347B1
EP1246347B1 EP02006922A EP02006922A EP1246347B1 EP 1246347 B1 EP1246347 B1 EP 1246347B1 EP 02006922 A EP02006922 A EP 02006922A EP 02006922 A EP02006922 A EP 02006922A EP 1246347 B1 EP1246347 B1 EP 1246347B1
Authority
EP
European Patent Office
Prior art keywords
radiating fin
heat radiating
negative
frame
negative heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02006922A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1246347A2 (en
EP1246347A3 (en
Inventor
Akiya c/o Denso Corporation Shichijyo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Publication of EP1246347A2 publication Critical patent/EP1246347A2/en
Publication of EP1246347A3 publication Critical patent/EP1246347A3/en
Application granted granted Critical
Publication of EP1246347B1 publication Critical patent/EP1246347B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
    • H02K11/049—Rectifiers associated with stationary parts, e.g. stator cores
    • H02K11/05—Rectifiers associated with casings, enclosures or brackets

Definitions

  • the present invention relates to a vehicle AC generator mounted on a passenger car, an auto truck and the like.
  • a positive-side radiating fin and a negative-side radiating fin are stacked in an axial direction and a terminal board having connecting terminals is interposed therebetween.
  • Positive-side diodes and negative-side diodes are press-fitted and soldered in through holes provided in both of the radiating fins in the axial direction.
  • the negative-side radiating fin is directly fixed to the outer end surface of a housing with screws and grounded.
  • the negative-side radiating fin When the negative-side radiating fin is fixed to the housing, the negative-side radiating fin is likely to be deformed due to steps on fixing surfaces of the negative-side radiating fin and the housing. As a result, the through holes for fixing the negative-side diodes are deformed and a soldering as a jointing material causes cracks.
  • a positive-side radiating fin and a negative-side radiating fin are arranged in one plane surface with a predetermined space.
  • the negative-side radiating fin is directly fixed to the inner wall of a housing forming the outer case of a vehicle ac generator.
  • water and the like entering the vehicle ac generator are likely to accumulate and cause corrosion and the like therein.
  • US-A 5,296,778 discloses a vehicle AC generator comprising a frame, a rotor supported in the frame, a stator coil inside the frame for generating an AC voltage in operation, a rectifying device for rectifying said AC voltage, said rectifying device having a positive and a negative heat radiating fin with a plurality of diodes fitted in said heat radiating fins and wherein the negative heat radiating fin is fixed to the frame at a plurality of fixing portions.
  • a rectifying device that converts AC voltage generated in a stator coil by rotation of a rotor has a heat radiating fin and a terminal board.
  • a plurality of diodes is fixed to the heat radiating fins.
  • the terminal board embeds connecting terminals connecting the plurality of diodes.
  • the heat radiating fins have a plurality of fixing portions to be fixed to the frame and a groove is provided between two of the plurality of fixing portions on a side facing the frame or on a side opposite to the frame.
  • the groove is provided between the plurality of fixing portions of the heat radiating fin, when the heat radiating fin is fixed to the frame, excessive stress caused by steps on fixing surfaces of the frame and the heat radiating fin is eased by the groove. Accordingly, deformation of the heat radiating fin is decreased. Further, the groove functions as a drain for discharging water and the like entering near the rectifying device. Therefore, corrosion due to accumulated water and the like is suppressed.
  • a vehicle ac generator 1 has a stator 2, a rotor 3, frames 4, a brush device 5, a rectifying device 6, a rear cover 7, an IC regulator 9 and the like.
  • the stator 2 has a stator core 22, three-phase stator coils 23, and insulators 24 for electrically insulating between the stator core 22 and the stator coils 23.
  • the rotor 3 has a field coil 31, pole cores 32, and a rotor shaft 33.
  • the field coil 31 is wound about the pole cores 32 by cylindrically and concentrically winding an insulated copper wire.
  • Each of the pole cores 32 has six claw poles.
  • the rotor shaft 33 supports the pole cores 32 and the field coil 31 is sandwiched between the pole cores 32.
  • a cooling fan 35 is fixed to an axial end surface of the front side pole core 32 (left side in FIG. 1 ) by welding or the like.
  • the cooling fan 35 draws cooling air from a front side and discharges it in an axial direction and a radial direction.
  • a cooling fan 36 is fixed to an axial end surface of the rear side pole core 32 (right side in FIG. 1 ) by welding or the like.
  • the cooling fan 36 draws cooling air from a rear side and discharges it in the radial direction.
  • a pair of slip rings 37 and 38 are mounted on the substantially rear end of the rotor shaft 33 and electrically connected to both ends of the field coil 31. Electric power is supplied from the brush device 5 to the field coil 31 through the pair of slip rings 37 and 38.
  • the frames 4 accommodate the stator 2 and the rotor 3 therein.
  • the rotor 3 is rotatably supported around the rotor shaft 33.
  • the stator core 2 is arranged to face the outer periphery of the pole cores 32 with a predetermined clearance and fixed to the inner periphery of the frames 4.
  • the frames 4 have cooling air discharge windows 41 at parts corresponding to the stator coil 23 that protrudes from the axial end surfaces of the stator core 22 in the axial direction and air intake windows 42 on the axial end surfaces.
  • the brush device 5 guides exciting current from the rectifying device 6 to the field coil 31 of the rotor 3.
  • the brush device 5 has brushes 51 and 52 that are respectively pressed to the slip rings 37 and 38 on the rotor shaft 33 of the rotor 3.
  • the rectifying device 6 converts three-phase ac voltages generated in the three-phase stator coils 23 into dc output power.
  • the rear cover 7 covers and protects electrical components, such as the brush device 5, the rectifying device 6 and the IC regulator 9 mounted outside the rear side frame 4.
  • Bolts 43 are provided on the rear side frame 4 to protrude in the axial direction, so the rear cover 7 is fastened to the frame 4 by tightening metallic nuts 71 onto the bolts 43.
  • the rectifying device 6 is sandwiched between the rear side frame 4 and the rear cover 7.
  • the rear cover 7 has a plurality of air intake windows on a surface corresponding to the rectifying device 6. Cooling air is drawn into the inside of the rear cover 7 through the air intake windows.
  • the rectifying device 6 has a positive-side radiating fin 67, a negative-side radiating fin 68 and a terminal board 61, as shown in FIGS. 2 and 3 .
  • the positive-side radiating fin 67 and the negative-side radiating fin 68 are arranged to interpose the terminal board 61 therebetween and oppose each other in the axial direction with a spacing therebetween.
  • Six positive side diodes 63 are press-fitted in the axial direction in through holes provided on the positive-side radiating fin 67 as fixing holes. Leads 63a of the positive-side diodes 63 are directed to the frame 4 side, and jointed to connecting terminals 62 protruding from the terminal board 61 at junctions 621 by TIG welding.
  • Six negative-side diodes 65 are press-fitted in the axial direction in through holes provided on the negative-side radiating fin 68 as fixing holes. Leads 65a of the negative-side diodes 65 are directed to the rear side, and jointed to the connecting terminals 62 protruding from the terminal board 61 at junctions 622 by TIG welding.
  • the negative-side radiating fin 68 is substantially in an arc shape having a circular arc angle of equal to or more than 180 degrees, as shown in FIG. 3 .
  • the negative-side radiating fin 68 has a pair of circumferential ends 68X defining a spacing therebetween.
  • the negative-side radiating fin 68 is separated into at least two partial radiating fins 68A and 68B at a substantially middle part in the circumferential direction thereof, and defines a groove 68C between the partial radiating fins 68A and 68B substantially at the lower-most position of the fin 68.
  • the groove 68C is provided at a position, which is generally opposite in the radial direction to the spacing defined by the circumferential ends 68X.
  • Each of the partial radiating fins 68A and 68B has two fixing portions 69a and 69b, and 69c and 69d near its radially outer end.
  • the fixing portions 69a to 69d have through holes. Screws 72 are inserted through the fixing portions 69a to 69d and tightened to threaded holes provided in the frame 4, so the rectifying device 6 is fixed to the frame 4, as shown in FIG. 1 .
  • the deformation of the negative-side radiating fin 68 is decreased, it is restricted that fixing force of the negative-side diodes 65 press-fitted in the through holes changes due to use condition of the vehicle ac generator 1. Therefore, the negative-side diodes 65 are properly fixed by press-fitting. A complicated manufacturing process such as soldering is changed to a simple connection, thereby decreasing a manufacturing cost.
  • both of the partial radiating fins 68A and 68B have the substantially same area. Accordingly, the negative-side diodes 65 are equally cooled, thereby increasing durability and the cooling capacity of the negative-side diodes 65.
  • the negative-side radiating fin 68 has a groove 68D on its surface of the frame 4 side, in place of the groove 68C provided by separating the fin 68 into the partial radiating fins 68A and 68B (not showing an embodiment of the present invention).
  • the groove 68D is provided at a substantially middle part of the negative-side radiating fin 68 in the circumferential direction and substantially at the lower-most position of the fin 68.
  • a part of the negative-side radiating fin 68 where a thickness is reduced by forming the groove 68D becomes a thin wall portion 68E.
  • the groove 68D is formed on the surface of the negative-side radiating fin 68, not only the manufacturing process is simplified, but also the groove 68D functions as a drain for water and the like. Therefore, water and the like entering near the negative-side radiating fin 68 can be discharged through the groove 68D at the lower-most position of the rectifying device 6.
  • a groove 68F is provided on the surface of the negative-side radiating fin 68 at a side opposite to the frame 4.
  • the groove 68F is provided at a substantially middle part of the negative-side radiating fin 68 in the circumferential direction and substantially at the lower-most position of the fin 68.
  • a part of the negative-side radiating fin 68 where a thickness is reduced by forming the groove 68F becomes a thin wall portion 68G. Also in this case, advantages similar to the before described embodiment are provided.
  • the negative-side radiating fin 68 can have a plurality of grooves between adjacent two of fixing portions. The grooves may be provided near at least one of the fixing portions.
  • the rectifying device 6 is fixed to the outside of the frame 4 in the above embodiments, the rectifying device 6 may be fixed to the inside of the frame 4 in a case that the frame 4 entirely covers the rectifying device 6.
  • the embodiments may be used for a vehicle ac generator in which a positive-side radiating fin of a rectifying device is directly fixed to a frame. In this case, a groove is provided on the positive-side radiating fin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Motor Or Generator Cooling System (AREA)
EP02006922A 2001-03-29 2002-03-26 Vehicle AC generator Expired - Lifetime EP1246347B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001096915 2001-03-29
JP2001096915A JP3775235B2 (ja) 2001-03-29 2001-03-29 車両用交流発電機

Publications (3)

Publication Number Publication Date
EP1246347A2 EP1246347A2 (en) 2002-10-02
EP1246347A3 EP1246347A3 (en) 2003-09-17
EP1246347B1 true EP1246347B1 (en) 2009-03-25

Family

ID=18950770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02006922A Expired - Lifetime EP1246347B1 (en) 2001-03-29 2002-03-26 Vehicle AC generator

Country Status (4)

Country Link
US (1) US6958557B2 (ja)
EP (1) EP1246347B1 (ja)
JP (1) JP3775235B2 (ja)
DE (1) DE60231673D1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2847085B1 (fr) * 2002-10-28 2005-03-04 Valeo Equip Electr Moteur Dispositif de refroidissement de l'electronique de puissance integree a l'arriere d'un alternateur ou d'un alterno-demarreur
JP4089421B2 (ja) * 2002-12-19 2008-05-28 株式会社デンソー 車両用交流発電機
US20040256925A1 (en) * 2003-06-18 2004-12-23 Transpo Electronics, Inc. Rectifier for a vehicle alternator
JP4692439B2 (ja) * 2006-08-22 2011-06-01 株式会社デンソー 車両用交流発電機
JP4483842B2 (ja) * 2006-09-07 2010-06-16 株式会社デンソー 車両用交流発電機
JP4389974B2 (ja) * 2007-06-26 2009-12-24 株式会社デンソー 車両用交流発電機
JP4506820B2 (ja) * 2007-11-22 2010-07-21 株式会社デンソー 車両用交流発電機の整流装置
US8803382B2 (en) * 2008-06-16 2014-08-12 Mitsubishi Electric Corporation Rectifying device of vehicle alternator
DE102008002638A1 (de) * 2008-06-25 2009-12-31 Robert Bosch Gmbh Elektrische Maschine
JP5062864B2 (ja) * 2010-05-24 2012-10-31 三菱電機株式会社 交流発電機
JP5418861B2 (ja) 2011-06-23 2014-02-19 株式会社デンソー 車両用交流発電機
WO2013080258A1 (ja) * 2011-11-30 2013-06-06 三菱電機株式会社 車両用回転電機

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927336A (en) 1974-03-27 1975-12-16 Wagner Electric Corp Self-adjusting condition-responsive control circuit
US3927338A (en) * 1975-01-02 1975-12-16 Motorola Inc Automotive bridge assembly
DE2936204C2 (de) * 1979-09-07 1986-12-11 Robert Bosch Gmbh, 7000 Stuttgart Gleichrichtereinheit
JPH0119584Y2 (ja) 1980-05-09 1989-06-06
JPS59108340A (ja) 1982-12-14 1984-06-22 Toshiba Corp 半導体整流装置
US4720645A (en) 1985-11-22 1988-01-19 Stroud Lebern W Dual output alternator
DE3728081A1 (de) 1987-08-22 1989-03-02 Bosch Gmbh Robert Gleichrichterlagereinrichtung
JP2745554B2 (ja) 1987-09-02 1998-04-28 株式会社デンソー 交流発電機用整流装置、およびその製造方法
US5296778A (en) 1992-06-30 1994-03-22 Stroud Leburn W Three-four alternator coil winding with associated heat sinks
US5949166A (en) 1997-09-25 1999-09-07 Denso Corporation Rectifying apparatus for an automotive AC generator
FR2768870B1 (fr) 1997-09-25 2003-09-26 Denso Corp Alternateur pour un vehicule automobile
JP3820712B2 (ja) 1997-11-27 2006-09-13 株式会社デンソー 車両用交流発電機
JP3430016B2 (ja) 1998-06-05 2003-07-28 三菱電機株式会社 車両用交流発電機
JP3956524B2 (ja) 1999-03-03 2007-08-08 株式会社デンソー 車両用交流発電機
US6580187B2 (en) * 2000-01-14 2003-06-17 Delphi Technologies, Inc. Rectifier assembly for an air-cooled generator
KR20020001311A (ko) * 2000-06-28 2002-01-09 에릭 발리베 자동차용 교류발전기
JP4284860B2 (ja) * 2000-11-21 2009-06-24 株式会社デンソー 車両用交流発電機

Also Published As

Publication number Publication date
JP3775235B2 (ja) 2006-05-17
JP2002300756A (ja) 2002-10-11
EP1246347A2 (en) 2002-10-02
DE60231673D1 (de) 2009-05-07
EP1246347A3 (en) 2003-09-17
US20020140300A1 (en) 2002-10-03
US6958557B2 (en) 2005-10-25

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